Switch assembly



Sept. 29, 1970 S. J. DONAHUE ETAL SWITCH ASSEMBLY Filed April 5, 1968 2Sheets-Sheet l FlG.4-C

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FlGfl C Sept. 29, 1970 s. J. DONAHUE ETAL M 3,531,607

SWITCH ASSEMBLY Filed April 5, 1 968 2 Sheets-Sheet 3 FlG.4-A"

- v v 60 38-C 1 R I'l 63 34 se-c, l 5 I 1 58-0 3,531,607 SWITCH ASSEMBLYSimeon .l. Donahue, Cheshire, Conn., and Edward J. Kosowicz, deceased,late of Trumbull, Comm, by John P. Evans, executor, Easton, Conn.; saidDonahue assignor to American Chain & Cable Company, Bridgeport, Conn., acorporation of New York Filed Apr. 5, 1%8, Ser. No. 719,273 Int. Cl.I-lOlh 35/40 U.S. Cl. 200-83 14 Claims ABSTRACT OF THE DISCLOSUREBACKGROUND OF THE INVENTION Switch assemblies of the type having apressure responsive element for controlling the actuating member of anelectric switch are used for a wide variety of industrial applications.Heretofore, however, difiiculties have been encountered in the rapid andstraightforward adjustment of the particular pressure setting at whichthe actuating member of the switch is effective to control itselectrical circuit. In the manufacture of the assemblies, for example,it often is desirable to test and adjust each individual assembly toensure operation of the actuating member at the desired pressure, and inmany prior assemblies the making of the necessary adjustments has provedboth time consuming and unwieldy.

Similarly, during the use of the assemblies in the field, it frequentlyis advantageous to be able to adjust the set point to a different ormore accurate setting. In several types of assemblies previouslyemployed, the set point is permanently built into the unit, with theresult that any adjustment is precluded and a change in set pointnecessitates the purchase of a completely new assembly. Other types ofprior assemblies have been designed so that they may be taken apart bythe user, thus enabling the relocation of the switching element, theadjustment of biasing springs, etc., to vary the set point. Suchdisassembly often has been a time consuming procedure and renders thereassembled parts subject to misalignment or other deficiencies.

SUMMARY OF THE INVENTION One general object of this invention,therefore, is to provide a new and improved pressure sensitive switchassembly for actuating an electric switch in response to a predeterminedinput pressure.

More specifically, it is an object of this invention to provide apressure switch assembly of the character indicated which may be readilyadjusted during the manufacturing process to ensure actuation at thepreselected pressure.

Another object of the invention is to provide such switch assembly inwhich the set point of the assembly may be varied over a wide range.

Still another object of this invention is to provide a pressure operatedswitch assembly utilizing comparatively simple mechanical and electricalcomponents which is economical to manufacture and thoroughly reliable inoperation.

In one illustrative embodiment of this invention, the

United States Patent O assembly comprises a casing member having adiaphragm or other pressure responsive element sealably mounted therein.The element includes a portion which is linearly movable in response tovariations in the applied pressure and is positioned in predeterminedrelationship with the actuating member of an electric switch to operatethe switch in response to a preselected pressure. In order to adjust thepressure setting at which the actuating member is effective to operatethe switch, the predetermined relationship between the linearly movableportion of the pressure responsive element and the actuating member maybe varied in a rapid and straightforward manner without the need fortaking the assembly apart.

In accordance with one feature of the invention, the adjustment meansdefines an inclined ramp or plane which extends at an acute angle withrespect to the direction of movement of the linearly movable portion ofthe pressure responsive element. In certain advantageous embodiments,the ramp is mounted on the pressure responsive element, and the switchunit is readily rotatable or otherwise movable relative thereto to carrythe actuating member in a direction transverse to the direction ofmovement of the linearly movable portion. Because of the inclined ramp,the movement of the switch unit is effective to vary the spacing betweenthe actuating member and the pressure responsive element and thus changethe preselected operating point of the assembly.

In other good embodiments in accordance with the in- BRIEF DESCRIPTIONOF THE DRAWINGS The present invention as well as further objects andfeatures thereof will be understood more clearly and fully from thefollowing description of certain preferred embodiments, when read inconjunction with the accompanying drawings, in which:

FIG. 1A is a top plan view of a pressure actuated switch assembly inaccordance with one illustrative embodiment of the invention;

FIG. 1B is a sectional view taken along the line 1B-1B in FIG. 1A, withcertain portions shown in elevation;

FIG. 1C is a side view of the assembly as seen from the line 1C1C inFIG. 1A;

FIG. 2A is a top view similar to FIG. 1A but showing a switch assemblyin accordance with another illustrative embodiment of the invention;

FIG. 2B is a sectional view taken along the line 2B2B in FIG. 2A, withcertain portions shown in elevation;

FIG. 2C is a side View of the assembly as seen from the line 2C-2C inFIG. 2A;

FIG. 3A is a sectional view of a switch assembly in accordance with afurther illustrative embodiment of the invention, taken along the line3A3A in FIG. 3B, with certain portions shown in elevation;

FIG. 3B is a sectional view taken along the line 3B 3B in FIG. 3A, withcertain portions shown in elevation;

FIG. 4A is a top plan view of a switching assembly in accordance withstill another illustrative embodiment of the invention;

FIG. 4B is a sectional view taken along the line 4B 4B in FIG. 4A, withcertain portions shown in elevation; and

FIG. 4C is a perspective view showing the pressure responsive elementutilized in the assembly of FIGS. 4A and 4B.

15 DESCRIPTION OF CERTAIN PREFERRED EMBODIMENTS Referring to FIG. 1B ofthe drawings, the switch assembly includes a pressure responsivediaphragm of circular, substantially planar configuration. The diaphragm10 is supplied with a variable input pressure from a fitting 11 which isaflixed to a generally cup-shaped casing member 16. The periphery of thediaphragm is sealed to the casing member, as at 22, by brazing,soldering or a suitable adhesive such as that available under thedesignation Stycast 2651 from Emerson & Cuming, Inc., Canton, Mass.

The pressure responsive diaphragm 10 is supported in predeterminedcooperating relationship with a switch unit 12 of conventionalconstruction. The unit 12 advantageously is of the snap-action type andmay be obtained from various sources including the Microswitch Divisionof Honeywell, Inc. under designation 1SX12T. The unit 12 includes outputterminals 21 which are connected in an electrical circuit (not shown) toprovide make, break and transfer functions depending upon the circuitrequirements. A housing 13 of phenolic plastic material serves tosupport the unit 12 and is aflixed thereto by an epoxy adhesive 20.

A circular support plate 14 is mounted on the side of the diaphragm 10opposite that adjacent the casing 16. The rim of the casing 16 is rolledover the periphery of the support plate 14 to firmly clamp the diaphragmtherebetween. The plate 14 includes an elongated rectangular aperture14A therein which is of a size sufficient to accommodate the switch unit12 but is somewhat shorter than the housing 13. This aperturecommunicates with a recess 14B (FIG. 1C) in the upper portion of theplate 14. The housing 13 is slidably positioned in the recess 14B toenable movement of the switch 12 in a direction transverse to thedirection of movement of the diaphragm for purposes that will becomemore fully apparent hereinafter.

The switch unit 12 includes an actuating pin in predeterminedcooperating relationship with the central portion of the diaphragm 10.Rigidly mounted on this portion of the diaphragm is a ramp 17 having asurface adjacent the pin 15 which is disposed in an inclined flat plane.The plane intercepts the direction of movement of .the diaphragm portionat an acute angle and meets the plane of the diaphragm at an angle whichillustratively is of the order of about 6. The ramp 17 may be embosseddirectly on the upper surface of the diaphragm, or it may form aseparate part which is welded or otherwise aflixed thereto.

The housing 13 and its attached switch unit 12 are held in positionrelative to the support plate 14 and the diaphragm 10 by two leafsprings 18A and 18B (FIGS. 1A and 1C). These springs are removablyaffixed to the upper surface of the housing 13 by screws 19A and 19B.The springs 18A and 18B are provided with bends 18C and 18D,respectively, along their edges contiguous to the housing 13 which serveto hold the housing in rigid but adjustable relationship with the plate14.

Upon the application of a preselected input pressure to the fitting 11,the central portion of the diaphragm 10 moves upwardly, as viewed inFIG. IE, to similarly move the ramp 17 thereon. The inclined surface ofthe ramp exerts a force against the actuating pin 15 to operate thesnap-action switch 12.

In order to adjust the particular pressure for which the apparatus iseffective to operate the switch 12, the switch and its housing 13 aremanually moved in a lateral direction relative to the diaphragm 10.During this movement, the distance between the actuating pin 15 and theinclined surface of the ramp 17 changes to either increase or decreasethe preselected operating pressure. When the desired relativerelationship between the actuating pin and the ramp is reached, thescrews 19A and 19B are tightened to hold the switch in its new position.The arrangement is such that the assembly may be quickly and easilyadjusted to produce operation of the switch over a wide range of inputpressures without the need for disassembling the apparatus or for makingstructural changes in the various parts. This adjustment may beaccomplished with substantially equal facility either during themanufacturing process or in the field. The leaf springs 18A and 18Bserve not only to afiirmatively hold the switch in the adjusted positionbut to guide the switch during its lateral movement.

In the embodiment of the invention illustrated in FIGS. 1A, 1B and 1C,the assembly is adjusted in accordance with the desired set point bymoving the switch unit 12 in a lateral direction relative to an inclinedramp on the pressure responsive diaphragm 10. In other advantageousarrangements, the ramp may be formed on the support for the switch unit.In the embodiment shown in FIG. 2B, for example, there is provided aswitch unit 32 having a circular support plate 34 which includes asloping upper surface 37. This surface serves as an inclined ramp whichextends at an acute angle with respect to the direction of movement of aplate 27 on the upper surface of the diaphragm 30. The ramp 37 supportsa switch housing 33 having a lower surface which is similarly inclinedso that it may slide smoothly along the ramp. The switch 32 is of thesnap-action type and includes an actuating pin 35 and three terminals41. The switch is carried in a suitable aperture in the housing 33 andis aflixed thereto by an epoxy adhesive 40. A pair of leaf springs 38Aand 38B (FIGS. 2A and 2C) are mounted on the upper surface of thesupport plate 34 on opposite sides of the housing 33. These springs areprovided with bends 38C and 38D and are held in place by screws 39A and39B, respectively, in a manner similar to that described heretofore.

The assembly is designed to operate the actuating pin 35 of the switchunit 32 in response to a preselected pressure supplied to an inputfitting 31. The pressure is applied to one side of the diaphragm 30-from a pressure casing 36 and is effective to move the plate 27 on theop posite side of the diaphragm against the pin 35 to operate theswitch. In order to change the set point of the assembly, the housing 33and the switch 32 are slidably adjusted up and down the ramp 37, therebyraising or lowering the position of the pin 35 relative to the plate 27.

In some embodiments of the invention, the leaf springs 38A and 38B maybe eliminated, and the switch housing may be provided with elongatedlaterally extending slots (not shown). These slots accommodate suitablelocking screws which serve to guide the housing during its movementalong the inclined ramp and to hold the housing in position upon thecompletion of the adjustment.

Referring now to FIGS. 3A and 313, there is shown a pressure sensitiveswitch assembly in accordance with a further embodiment of the inventionwhich is particularly suitable for the accurate and precise adjustmentof the set point during manufacture. The assembly includes a pressuresensitive capsule or bellows which is supplied with air under pressurefrom an input fitting 51. The fitting 51 includes an inlet opening 56and is provided at its inner end with a reduced portion 63 aifixed toone side of the bellows 50.

The side of the bellows 50 opposite that adjacent the fitting portion 63is provided with a ramp member 57. The member 57 is movable in a lineardirection (a vertical direction, as viewed in FIG. 3B) in response tochanges in pressure within the bellows, and the upper surface of themember lies in a flat inclined plane extending at an acute angle withrespect to the direction of movement. This surface cooperates with theactuating pin of a snap-action switch 52 to control the electricalcircuit connected to the switch terminals 61.

The snap-action switch 52 is permanently aifixed, as at 65, within arectangular opening in a cup-shaped housing plate 53. The periphery ofthe plate 53 similarly is affixed to the inner wall of a generallytubular casing 54 which encloses the switch 52 and the bellows 50. Thecasing 54 defines an interior chamber 58 which is vented at 64 tomaintain the chamber at atmospheric pressure. The lower portion of thechamber is substantially closed by a plate 62. The input fitting 51extends into the chamber 58 through a suitable aperture 66 in the plate62. The diameter of this aperture is sufiicient to permit unobstructedrotary movement of the fittingSl with respect to the switch casing 54. Acollar 60 surrounds the in wardly extending portion of the fitting 51and is staked at 67 thereto.

To adjust the set point of the assembly, the fitting 51 is rotatedrelative to the casing 54 and the switch unit 52 to similarly rotate thebellows 50 and the ramp 57. The actuating pin 55 of the switch islocated at a point which is spaced from the axis of rotation of theramp. As the ramp rotates, the distance between the ramp and the pin isvaried to change the point at which a given input pressure to thebellows 50 will cause operation of the switch. By rotating the bellows50 and the ramp 57 through an angle of one hundred and eighty degrees,the set point is varied over the entire range of adjustment.

When the distance between the ramp 57 and the actuating pin 55 has beenadjusted by rotation of the fitting 51 in accordance with the selectedactuating point, the fitting is permanently attached to the bottom plate62 of the switch casing 54 to prevent any further rotation or change ofposition. This attachment may be accomplished through the use of Stycastadhesive 59 which is applied around the joint between the fitting andthe plate. When the adhesive hardens, it is effective to prevent furtheradjustment of the actuating point and also to provide an airtight seal.

In some embodiments of the invention, the switch assembly may beadjusted by rotating the pressure input fitting relative to the switchunit both during the manufacturing process and in the field. Referringto FIGS. 4A, 4B and 4C, for example, there is shown a pressureresponsive diaphragm 70 which is brazed, soldered or otherwisepermanently affixed to an internal step or ledge 82 within an inputfitting 71. The diaphragm 70 cooperates with a switch unit 72 having anactuating pin 75 and three output terminals :81. The unit 72 is mountedin a rectangular opening in a switch housing 73 which is rotatablycarried on a second ledge 83 within the open upper portion of thefitting 71. A retaining ring 74 is positioned around the upstandingportion of the housing 73 and is arranged to exert a comparativelystrong pressure against the interior wall of the fitting 71 toresiliently hold the housing and the fitting in fixed but adjustablerelationship with each other.

One side of the diaphragm 70 communicates with an input chamber 76within the fitting 71. As best shown in FIG. 4C, the opposite side ofthe diaphragm 70 is provided with a generally helical ramp 77 having aninclined upper surface which extends at an acute angle with respect tothe direction of movement of the diaphragm. The ramp 77 is annular inplan view, and the actuating pin 75 of the switch 72 is offset such thatthe pin is in a position to contact the ramp at all times.

To vary the preselected operating point of the assembly, the upstandingportion of the switch housing 73 is rotated relative to the fitting 71to produce a corresponding change in the distance between the actuatingpin 75 and the inclined surface of the ramp 77. Depending upon thespring tension in the retaining ring 74, the rotational movement of thehousing 73' may be accomplished by hand or with a wrench or othersuitable tool. After the housing has been rotated in accordance with thedesired operating point, the spring tension is sufficient to maintainthe various parts in their new positions.

In cases in which it is desirable to adjust the assembly to a particularoperating point and to then prevent further 7 adjustment, when thehousing 73 has been moved to the desired position a suitable bonding orsealing material is placed in the well 78 between the housing and theadjacent lip of the fitting 71. One advantage of the helically risingramp 77 is that the inclined upper surface of the ramp provides a longerslope and thus enables the realization of an extremely sensitiveadjustment. The annular path of this surface extends through an angle ofslightly less than 360 to enable the accurate variation of the set pointpressure over a wide range.

The terms and expressions which have been employed are used as terms ofdescription and not of limitation, and there is no intention in the useof such terms and expressions, of excluding any equivalents of thefeatures shown and described, or portions thereof, it being recognizedthat various modifications are possible within the scope of theinvention claimed.

What is claimed is:

1. A pressure sensitive switch assembly comprising, in combination, apressure responsive element movable in response to variations inpressure applied thereto, an electric switch element having actuatingmeans in predetermined cooperating relationship with said pressureresponsive element, the movement of said pressure responsive elementcontrolling said actuating means to operate said switch element inresponse to a preselected applied pressure, means for maintaining saidswitch element in fixed but adjustable juxtaposition with said pressureresponsive element, to hold said actuating means in said predeterminedcooperating relationship, and means including an inclined ramp connectedto one of said elements, said ramp having a bearing surface extending ina single flat plane which intersects the direction of movement of saidpressure responsive element at an acute angle, and switch element beingmovable relative to said pressure responsive element to vary thepredetermined relationship between said actuating means and saidpressure responsive element, to thereby adjust the preselected pressureat which said actuating means is effective to operate said switchelement.

2. A pressure sensitive switch assembly comprising, in combination, apressure responsive element including a portion linearly movable inresponse to variations in pressure applied thereto, an electric switchelement having actuating means in predetermined cooperating relationshipwith the linearly movable portion of said pressure responsive element,the movement of said linearly movable portion controlling said actuatingmeans to operate said switch element in response to a preselectedapplied pressure, means for maintaining said switch element in fixed butadjustable juxtaposition with said pressure responsive element, to holdsaid actuating means and said linearly movable portion in saidpredetermined cooperating relationship, and means on one of saidelements and defining a single inclined plane extending at an acuteangle with respect to the direction of movement of said linearly movableportion for enabling the variation of the predetermined relationshipbetween said actuating means and said linearly movable portion, tothereby adjust the preselected pressure at which said actuating means iseffective to operate said switch element.

3. A pressure sensitive switch assembly comprising, in combination, acasing member, a pressure responsive element mounted in said casingmember, said pressure responsive element having a generally planarportion movable in response to variations in pressure applied thereto,an electric switch element having actuating means in predeterminedcooperating relationship with said pressure responsive element, themovement of said pressure responsive element controlling said actuatingmeans to operate said switch element in response to a preselectedapplied pressure, means for maintaining said switch element in fixed butadjustable juxtaposition with said pressure responsive element, to holdsaid actuating means in said predetermined cooperating relationship, andmeans permanently afiixed to the planar portion of said pressureresponsive element and having a bearing surface extending in a singleflat plane inclined at an angle with respect thereto for enabling thevariation of the predetermined relationship between said actuating meansand said pressure responsive element, to thereby adjust the preselectedpressure at which said actuating means is effective to 0pcrate saidswitch element.

4. A pressure sensitive switch assembly comprising, in combination, acasing member, a pressure responsive element mounted in said casingmember, said pressure responsive element including a portion linearlymovable in response to variations in pressure applied thereto, anelectric switch element having actuating means in predeterminedcooperated relationship with the linearly movable portion of saidpressure responsive element, the movement of said linearly movableportion controlling said actuating means to operate said switch elementin response to a preselected applied pressure, adjustment means formaintaining said switch element in fixed but adjustable juxtapositionwith said pressure responsive element, to hold said actuating means andsaid linearly movable portion in said predetermined cooperatingrelationship, and ramp means on said linearly movable portion anddefining a single inclined plane extending at an acute angle withrespect to the direction of movement thereof for enabling the variationof the predetermined relationship between said actuating means and saidlinearly movable portion, to thereby adjust the preselected pressure atwhich said actuating means is effective to operate said switch element.

5. A pressure sensitive switch assembly of the character set forth inclaim 4, in which said electric switch element is linearly movable withrespect to said pressure responsive element in a direction transverse tothe direction of movement of said linearly movable portion, to vary theposition of said actuating means relative to said linearly movableportion.

6. A pressure sensitive switch assembly of the character set forth inclaim 4, in which said electric switch element is rotatably movable withrespect to said pressure responsive element, to vary the position ofsaid actuating means relative to said linearly movable portion.

7. A pressure sensitive switch assembly of the character set forth inclaim 6, in which said ramp means is of helical configuration.

8. A pressure sensitive switch assembly comprising, in combination, acasing member, a pressure responsive element mounted in said casingmember, said pressure responsive element including a portion linearlymovable in response to variations in pressure applied thereto, anelectric switch element having actuating means in predeterminedcooperating relationship with the linearly movable portion of saidpressure responsive element, the movement of said linearly movableportion controlling said actuating means to operate said switch elementin response to a preselected applied pressure, adjustment means formaintaining said switch element in fixed but adjustable juxtapositionwith said pressure responsive element, to hold said actuating means andsaid linearly movable portion in said predetermined cooperatingrelationship, and ramp means on said electric switch element anddefining a single inclined plane extending at an acute angle withrespect to the direction of movement of said linearly movable portionfor enabling the variation of the predetermined relationship betweensaid actuating means and said linearly movable portion, to therebyadjust the preselected pressure at which said actuating means iseffective to operate said switch element.

9. A pressure sensitive switch assembly of the character set forth inclaim 8, in which said ramp means comprises a housing member affixed tosaid electric switch element, and support means connected to the casingmember for said pressure responsive element and having a single inclinedsurface disposed in said inclined plane, said housing member beinglinearly movable along the inclined surface of said support means tovary the position of said actuating means relative to the linearlymovable portion of said pressure responsive element.

10. A pressure sensitive switch assembly comprising, in combination, acasing member, a pressure responsive element sealably mounted in saidcasing member, said pressure responsive element being of generallyplanar configuration and including a portion linearly movable inresponse to variations in pressure applied thereto, an electric switchelement having actuating means in predetermined cooperating relationshipwith the linearly movable portion of said pressure responsive element,the movement of said linearly movable portion controlling said actuatingmeans to operate said switch element in response to a preselectedapplied pressure, means for maintaining said switch element in fixed butadjustable juxtaposition with said pressure responsive element, to holdsaid actuating means and said linearly movable portion in saidpredetermined cooperating relationship, and means connected to one ofsaid elements and defining a single inclined plane extending at an acuteangle with respect to the direction of movement of said linearly movableportion for enabling the variation of the predetermined relationshipbetween said actuating means and said linearly movable portion,to'thereby adjust the preselected pressure at which said actuating meansis effective to operate said switch element.

11. A pressure sensitive switch assembly comprising, in combination, acasing member, a pressure responsive element sealably mounted in saidcasing member, said pressure responsive element being of generallyplanar configuration and including a central portion linearly movable inresponse to variations in pressure applied thereto, an electricsnap-action switch element having actuating means in predeterminedcooperating relationship with the linearly movable portion of saidpressure responsive element, the movement of said linearly movableportion controlling said actuating means to operate said switch elementin response to a preselected applied pressure, spring means formaintaining said switch element in fixed but adjustable juxtapositionwith said pressure responsive element, to hold said actuating means andsaid linearly mov able portion in said predetermined cooperatingrelationship, and means connected to one of said elements and having abearing surface extending in a single flat plane inclined at an acuteangle with respect to the plane of said pressure responsive element forenabling the variation of the predetermined relationship between saidactuating means and said linearly movable portion, to thereby adjust thepreselected pressure at which said actuating means is effective tooperate said switch element.

12. A pressure sensitive switch assembly of the character set forth inclaim 11, in which said spring means comprises a pair of leaf springscooperating with opposite sides of said switch element, said leafsprings guiding said switch element during the adjustment thereofrelative to said pressure responsive element.

13. A pressure sensitive switch assembly of the character set forth inclaim 11, in which said casing member includes a circular lipsurrounding said switch element in spaced relationship therewith, andsaid spring means comprises an annular spring in resilient engagementwith said lip.

14. A pressure sensitive switch assembly comprising, in combination, acasing member, a pressure responsive element sealably mounted in saidcasing member, said pressure responsive element being of generallyplanar configuration and including a portion linearly movable inresponse to variations in pressure applied thereto, an electric switchelement having actuating means in predetermined cooperating rclationshipwith the linearly movable portion of said pressure responsive element,the movement of said linearly movable portion controlling said actuatingmeans to operate said switch element in response to a preselectedapplied pressure, means for maintaining said switch element in fixed butadjustable juxtaposition with said pressure responsive element, to holdsaid actuating means and said linearly movable portion in saidpredetermined cooperating relationship, said switch element beingrotatably movable with respect to said pressure responsive element, andmeans including a helical ramp connected to said pressure responsiveelement and defining a single inclined plane extending at an acute anglewith respect to the direction of movement of said linearly movableportion for enabling the variation of the predetermined relationshipbetween said actuating means and said linearly movable portion inresponse to rotary movement of said switch element with respect to saidpressure responsive element, to thereby adjust the preselected pressureat which said actuating means is effective to operate said switchelement.

References Cited UNITED STATES PATENTS 2,554,535 5/1951 Long 61: a1 337117 2,671,839 3/1954 Cox 337-319 2,722,580 11/1955 Hasselhorn et a1.ZOO-83.91 3,067,302 12/1962 Nielsen 200433.91 XR FOREIGN PATENTS 692,3098/1964 Canada.

ROBERT S. MACON, Primary Examiner J. R. SCOTT, Assistant Examiner US.Cl. X.R. 200 153

